George sinclair



(No Model.)

, y G. SINGLAIR.

APPARATUS FOR SUPERHEATING STEAM.

Patented May 5, 1896.

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ANOREW ILGRJHAM. PHOTO-UTKQWASHINGYUNAUQ UNITED STATES GEORGE 'SINCLAIR OF ITEITI-I, SCOTLAND.

APPARATUS FOR SUPERHEATING STEAM.

SPECIFICATION forming part of Letters Patent No. 559,623, dated May 5, 1896.

Application filed December Z6, 1895. Serial No. 573,367. (No model.) Patented in England August 3,1894,No. 14,874.

To @ZZ whom it may concern:

Be it known that I, GEORGE SINCLAIR, a subject of the Queen of Great Britain and Ireland, and a resident of Leith, in the county of Mid-Lothian, Scotland, have invented certain Improvements in Apparatus for Superheating Steam, (for which I have obtained a British patent, No. 14,87 1i, dated August 3, 1894,) of which the following is a specification.

My said invention has for its object to improve the construction and arrangement of apparatus for superheatin g steam, and to apply for such purposes in a better manner than heretofore some of the heat remaining in the iregases of a steam-boiler after they have acted on. the main parts of the boiler itself.

In carrying out my invention I employ long lengths of comparatively small tubing-say of from one to tivo inches in diameter-and I have each length bent into zigzag loops to form a sheet-like section, such as will lie upon or against a flat surface, but with openings through the loops. The tube of each section or sheet has flanges at its ends for bolting to flanges on a main inlet-pipe and a main outlet-pipe, and a number of the tubular sections or sheets are grouped together and are placed vertically in one or more fines or spaces through `which the fire-gases pass.

In order that my said invention and the manner of performing the same may be properly understood, I hereunto append a sheet of explanatory drawings, to be hereinafter referred to, and showing an example of my improved apparatus.

Figures 'l and :2 of the drawings are vertical sections, as at right angles to each other, of my improved apparatus as applied to a horizontal cylindrical land-boiler- In the drawings the same reference-letters are used to mark the same or like parts wherever they are repeated.

In my apparatus (shown in Figs. l and 2 as applied to a horizontal cylindrical boiler with return iiregas tubes) there are, for superheating the steam, two groups of the tubular sections or sheets placed one on each side of the middle immediately above the curved top of the boiler, and each section consists of a length of small tubing A, bent into zigzag loops with openings through them. Each tube A has flanges B and C at its ends for bolting to flanges on the main inlet-pipe D and a main outlet-pipe F. Steam is admitted from the boiler into the main inlet-pipe D by means of a pipe G, provided with a stop-valve H, and passing through the tubes A to the main outlet-pipe F goes by a pipe J, provided With a stop-valve K, to a main steam-pipe L. Then the tubes A require examination or repair, the steam may be shut ori from them by means of the stop-valves II and K and made to pass directly through a stop-valve M to the main steanrpipe L, and then any tubular section or sheet can be disconnected and With drawn upward Without interfering with any other section. The movable covers Y, resting on the brick casing and on transverse 1 bearers Z, are provided to allour of the tubular sections A being easily Withdrawn. The tubular sections or sheets being vertical are supported at intermediate points on horizontal bars N, extending through some of the upper loops and being xed into the brick or equivalent casing. The nre-gases pass from the nre-gas tubes P into the smoke-box Q and (the damper R on eac-h side of the boiler having been previously closed) proceed by the opening S into the space inclosing the tubular sections and iinally escape by the opening T to the iiue V. lVhen it is not wished to use the superheating apparat-us, the by-pass dampers R are opened and the fire-gases escape directly to the ilue V. Two doors IV are provided at the front of the boiler for cleaning purposes.

An important feature of my apparatus is that none of the tube-joints are exposed to the action of the nre-gases.

What I claim as my invention is- Apparatus for superheating steam, com* prising groups of tubes, each of which tubes is bent into zigzag loops to form a sheet-like section, and is bolted to a main inlet and a main outlet pipe, the groups of tubes being placed vertically in one or more nues or spaces through Which the fire-gases pass, but Without exposure of the joints to great heat substantially as herein set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GEORGE SINCLAIR.

lVitnesses:

EDMUND HUNT,

Devin FERGUSON.

IOD 

